Mycoses in the elderly population: what a 16‐year experience has taught us

Abstract

tous hamartoma, congenital smooth muscle hamartoma, dermatofibroma, piloleiomyoma, and plexiform neurofibroma. Besides, all the previous reports of FHI with hypertrichosis presented as skin-colored or pigmented nodule or plaque. In this scenario, a differential diagnosis of FHI is rarely suspected, partly because of the lack of any convincing clinical morphology and secondly because of the rarity of the condition. To add to the problem, the lateonset of FHI can further delay the diagnosis. Dermoscopic features of FHI, as per our search, have not been reported before. In our case, the dermoscopic features reflect the associated epithelial-folliculosebaceous induction. Histopathologically, a characteristic triphasic organoid arrangement is the hallmark of FHI. There can be significant variability in the proportion of each component and even one or two of the components may be absent. By performing a punch biopsy, the diagnosis of FHI is more likely to be missed, unless an IHC for CD34 is done, which can provide a valuable clue, as in our case. In conclusion, we report a rare case of late-onset FHI with hypertrichosis that, in addition to classic triphasic pattern, also showed epithelial-folliculosebaceous-eccrine induction and foci of lymphoid aggregates. The differential diagnosis of FHI is to be considered for a skin-colored to pigmented deep dermal to subcutaneous nodule, especially when associated with hypertrichosis.